Fault-uplift superimposed mineralization of Dongsheng uranium deposit

Dongsheng deposit is an oversize uranium deposit which was found at the northeast of Ordos basin in re- cent years, so the research of this deposit has significance for the metallogenic theory and prospecting. It was considered as an interlayer oxidation zone type deposit early, but through the further analysis of the data, it was found that this viewpoint could not explain the mineralization process completely. A fault-uplift structure was found by u- sing the remote sensing technology to study the regional tectonic background, and the deposit is on the south of it. Also this fault-uplift is considered superimposed on slope zone metallogenic background which is the early provenance area. Based on these work, a theory that the generation and development of fault-uplift promote the evolution of mineralization of Dongsheng uranium deposit was put forward after reviewing the theory of paleo-interlayer- oxidation type sandstone-hosted uranium deposit and the relationship of fault-uplift superimposition and uranium mineralization are discussed. Afterward, the viewpoint that the superimposition of fault-uplift is the inducement of superposition metallogenesis of Dongsheng deposit is demonstrated from many aspects, such as the uplift effect of fault-uplift, the tectothermal events and the guidance of the fracture on the margin of the fault-uplift. Not only the depositional system and oxidation zone, but also the geological structure and the evidence of the movement of the deep substance in the earth should be attach importance to for the exploration of this type deposit. (authors)